Customer wants to secure single user login to ssim hence wants to change the grub password.
During the installation of ssim, wizard asks for one common password for all accounts.The password is assigned to all ssim linux accounts (root,db2admin,simuser, etc).This same password is applied to grub as well and corresponding hashed entry is made in grub.conf file below password line.
User will require this password to access the ssim through single user mode.
However it is not possible to change the grub password at some point later.
Password for the grub is set during installation of ssim however it is not possible to change the grub password later.